Title:
SWITCHING POWER SUPPLY DEVICE, AND METHOD FOR CONTROLLING SWITCHING POWER SUPPLY DEVICE
Document Type and Number:
WIPO Patent Application WO/2004/059822
Kind Code:
A1
Abstract:
On and off operations of an NMOS (22) cause a DC voltage (EO) to be charged into a capacitor (24) and also cause a DC output voltage (VO), which is to be supplied to a load (L) by a DC/DC converting circuit (30), to be charged into a capacitor (34). A load state determining circuit (40) determines whether the load (L) is in a light load state or a non-light load state, and outputs a signal (S40) as a determination signal. When the load state determining circuit (40) outputs a signal of 'L' (S41) as a signal indicating that the load (L) is in the light load state, a time period setting circuit (41) outputs a signal of 'L' (S41) after a predetermined time period elapses. A PFC on/off switch circuit (42) receives the signal of 'L' (S41) to output a control signal of 'L' (S25) to a power factor improving circuit (20). Accordingly, if the load (L) gets into the light load state, the operation of the power factor improving circuit (20) stops after the predetermined time period elapses.
Inventors:
YAMADA TOMOYASU (JP)
SHIMADA MASAAKI (JP)
SHIMADA MASAAKI (JP)
Application Number:
PCT/JP2003/015739
Publication Date:
July 15, 2004
Filing Date:
December 09, 2003
Export Citation:
Assignee:
SANKEN ELECTRIC CO LTD (JP)
YAMADA TOMOYASU (JP)
SHIMADA MASAAKI (JP)
YAMADA TOMOYASU (JP)
SHIMADA MASAAKI (JP)
International Classes:
H02M1/00; H02M1/42; (IPC1-7): H02M3/28
Foreign References:
| JPH08111975A | 1996-04-30 | |||
| JPH07274498A | 1995-10-20 | |||
| JP2002058239A | 2002-02-22 | |||
| JP2000139075A | 2000-05-16 | |||
| US5949226A | 1999-09-07 | |||
| EP1102387A2 | 2001-05-23 |
Attorney, Agent or Firm:
Kimura, Mitsuru (Kyohan Building 7, Kandanishiki-cho 2-chom, Chiyoda-ku Tokyo, JP)
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